Examples of Validation Rules

Review examples of validation rules for various types of apps that you can use and modify for your own purposes. Validation rules verify that the data a user enters in a record meets the standards you specify before the user can save the record.
Available in: both Salesforce Classic and Lightning Experience
Available in: Contact Manager, Group, Professional, Enterprise, Performance, Unlimited, Developer, and Database.com Editions

User Permissions Needed
To view field validation rules: “View Setup and Configuration”
To define or change field validation rules: “Customize Application”

Use the following samples for validation rules in Salesforce and Force.com AppExchange apps, including: